Tin can.



$ M. E. DUNKLEYQ TIN CAN.

APPLIDATION FILED FEB. 23, 1907.

901,429, Patented Oct. 20, 1908.

Witnesses v Inventor,

UNITED STATES PATENT ()FFIQE.

MELVILIiE DUNKLE'Y, OF'KALAMAZOO', MIcmciN, residues TO THE HERMETIC OOMIIANY, or wnarme'ro n, DELAWARE.

' "rm can.

Specification of Letters Patent.

Patented Oct. 20, 1903.

Application filed Bellman-23, 1907. Serial No. 368,948.

To all whom it may concern: Be it known that I, M ELVILL'E E. DUNK LEY, a citizen of the United States, residing in-the'city and'county of Kalamazoo, State of Michigan, have invented certain new and useful Improvements in Tin Cans,.o f which the following is a specification.

This invention relates to improvements in tin cans for cannilw and reserving fruit, ve etables, meat, andthe lilie.

- The object of the invention is to provide a hermetically sealed can without sub'ecting the same to the heat necessary to sol er the to that is, to provide an improved can in w liGl'l the principle of seaming the cap into place is employed supplemented by my improvement, forming a hermetical sealed joint, and consequently a hermetical y sealed receptacle.

I accomplish the objects of my invention by the devices and means described in the following specification.

'The invention is clearly defined and pointed out in the claims.

A structure embodying the features of my invention is clearly illustrated in the accompanying drawing, forming a part of this specification, in which,

Fi ure 1 is a lan view of a can embodying the eatures o. my invention. Fig. 2 is a side elevation of the same. Fig. 3 is a plan view of the cap as it is formed up prior to s inning or seaming it into place. F 1g. 4 is a etail sectional View on line 4-4 of Fig. 3, showing the relation of the can to the cap .when the parts are brought together preparatory to the seeming process. Fig. 5 is a sec tional view on line- 5-5 of Fig. 1, showin the can after the same has been seamed an sealed.

In the drawing, similar numerals of reference refer to similar parts throughout the several views.

Considering the numbered parts of the drawing, the can 1 is of the usual form, having a flange 1 turned out at the top. The cap 2 is flangedoutwunlly and the outer ed e ofthe flange is turned or spun under on itse f, so that the'ilange thus J-shaped in cross section. Between the can and cap a small gasket 3, preferably of rubber, is placed.

After the can has been filled and while its contents are still hot, the cap 2 is pushed into lace down snugl'gagainst the gasket 3. he ange of'the cap is then spun under by any suitablespinning means until the joint is closed, as appears in Fig. 5;

- By taking reat pains in the rolling, it has been found t at a very large percentage of cans are effectively sealed bythis means, and

I am aware that this double seaming with a gaskethas been used'b'efore my invention. There is, however, 'a material percentage of waste by this method of seaming only. I I find that b thoroughly applying a little lacquer 4 in t e angle between the double seam and the body 1 of the can, when the same dries and hardens, a perfect joint is formed at that point, and, where the same has been used and applied, I have never found on the most careful and thorough tests that the contents of any can so sealed have deteriorated because of the entrance of air into its contents. This means is of very great advantage because the double seaming of the cans, or the seaming ofv the cans, to join the caps to the bodies has not proven satisfactory, and atthe present time much the larger proportion of cans are soldered in place. The intense heat necessary toeffect the soldering chars and destroys considerable of the contents of the can, besides not infreuently contaminating the contents, spotting it with charcoal and scorchin the same.

The lacquer can be applied substantially cold, and will harden, entirely fillin the narrow creases and sealing the same e ectively. This lacquer that is used here is very adhesive and tough and of a quick drying type, so that a suflicient volume of the same will be lodged in the crevices of the double seam and will have opportunity to rapidly dry out and harden and make a com lete joint of ,considerable resistance. Not a llacr ucrs are adapted to this purpose, because same must be adhesive in order that it In oughly adhere to the metal compos u: the joint, and the same should he suflic tough not to crackle, because the cracklin or the same would open the joint and admit the air to the same. extent that the defective seaming heretofore had admitted the air.

I have referred to lacquer. :nd the lacquer that serves the purpose very well is made up of copal' gum admlxcd with a considerable quantity of rosin," and the whole dissolved in benzin. The benzin very rapidly evaporates and leaves the layer of adhesive and tough copal gum and rosin in the crease, by affording opportunity for drying the same.

' their toughness.

tion was necessary before a material was se-- The seaming or double seamin might be the said cap and the can body, the said filled with a variety of varnis material, gums or other elastic substances, havin proper regard for their adhesive qualities an Considerable experimentacured that accomplished the result in a satisfactory manner.

Having thus described my invention, what I claim as new arid desire to secure by Letters Patent is,

1. The combination of a tin can body, a

ca therefor, the can and cap being flanged, a so t yielding gasket located between said r flanges, said flanges beingfolded in a down-' turned seam lying close against the can body and a seal of lacquer consisting of copal gum,

rosin and benzin, ap 'lied to the crevice between the downturn'e seam and can body.

2.,The combination of a tin-canbody, a cap therefor, the can and the ca being flangedya soft compressible gasket etween flanges bein folded into a downturned seam which lies 0 ose against the can body and a seal of adhesive plastic material applied to the crevice between the downturned seam and the can body.

3. The combination of a tin can body, a cap therefor, the can and the cap being flanged; the said flanges being folded into a downturned close double seam which lies close against the can body and a seal of adhesive plastic material applied to the crevice between the downturned scam and the can body.

In witness whereof, I have hereunto set my hand and seal in the presence of two witnesses.

MELVILLE E. DUNKLEY. 

